JPS63138232A - Vibration testing system - Google Patents

Abstract

PURPOSE:To execute a test of a product which is weak against a vibration, by controlling a vibration given to a specimen from a result of comparison of a detected vibration data of a part for measuring a vibration and a detected vibration data of a part for controlling a vibration, and a target vibration data and a vibration control data. CONSTITUTION:A data outputted by a limiter use acceleration sensor installed to a part for controlling a vibration in a specimen is collected by a limiter use OAD 6, a counter-limit value comparing module 9 compares said data and a limit data determined in advance, and an amplitude controller 14 controls an amplitude of a vibration which an exciting device S gives to the specimen T, based on a result of this comparison. In such a way, to a part for controlling a vibration in the specimen T, a vibration exceeding some extent is not given. Accordingly, even in case the specimen T is extremely weak against a vibration, a vibration test can be executed without damaging the specimen T.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a vibration test system for performing vibration tests on products.

(Conventional technology) In recent years, with advances in product development technology and intensifying competition between manufacturers, there has been an increasing demand for smaller products, higher density, lighter weight, and lower manufacturing costs. .

In particular, quality control and development to improve product reliability have become important, and manufacturing departments are constantly conducting vibration tests on products.

By the way, the main vibration test, the sine insertion vibration test,
In addition to requiring a large amount of testing time, there were problems in that troubles that could occur in actual use could not be reproduced in tests.

Due to these circumstances, multi-functional vibration testing systems have been developed in recent years, and by using various vibration methods, mainly random vibration, it has become extremely easy to conduct vibration tests similar to those in the actual product environment. .

This vibration testing system makes it possible to evaluate and confirm design performance and design limits during the development stage, and also to understand the resonance characteristics of a product, making it possible to design optimal packaging.

Furthermore, by conducting vibration tests on the final product, it becomes possible to detect assembly defects and initial defects at an early stage, and to strictly control the quality of products to be shipped.

By the way, some products are extremely susceptible to vibration and are damaged during vibration tests. This is especially common in large structures (artificial stars, aircraft, etc.).

Therefore, if the product is extremely susceptible to vibration, the vibration test must be carried out very carefully, which poses a problem of placing a heavy burden on the operator.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and aims to provide a vibration test system that can easily conduct vibration tests on products that are extremely susceptible to vibration.

[Configuration of the Invention (Means for Solving Problems) The vibration test system of the present invention includes: a vibrating means for applying vibration to a specimen; Collecting vibration data output from the vibration detection means, a second vibration detection means attached to a part of the specimen where vibration is to be regulated, and the first vibration detection means, and averaging each data. data collection means for collecting vibration data outputted by the second vibration detection means; data obtained from the first vibration detection means and predetermined target vibration data; a first data comparing means for comparing the data obtained by the second vibration detecting means and predetermined vibration regulation data; and vibration control means for controlling the amplitude of vibration that the vibrator stage gives to the specimen.

<Function> In the vibration test system of the present invention, the second data collection means collects the data output by the second vibration detection means attached to the part of the specimen where vibration is to be restricted, and the second data collection means The comparison means compares this data with predetermined vibration regulation data, and the vibration control means controls the amplitude of vibration applied to the specimen by the vibration means based on the comparison result.
Vibrations exceeding a predetermined level are not applied to the parts of the specimen whose vibrations should be regulated, and there is no risk of damage to the specimen.

(Example) Hereinafter, details of embodiments of the present invention will be explained based on the drawings.

FIG. 1 is a block diagram showing the configuration of a system according to an embodiment of the present invention.

In the figure, 1 is an excitation device S, an amplifier A1 for the excitation device,
Control acceleration sensor (4 channels, not shown), vibration regulation (hereinafter referred to as limit) acceleration sensor (32
channels, not shown), sensor amplifiers A2 and A3
and an external load consisting of connection cables, etc.

2 is a control overall detector (4 channels, hereinafter referred to as control OAD) that measures vibration level data (hereinafter referred to as RMS value) from the control acceleration sensor; 3 is once in one loop; RM for 4 channels
A data collection/average processing module that reads the S values into memory and averages them; 4 is a target spectrum data storage module that stores target spectrum data set during setup; 5 is a module that stores the RMS values of the target spectrum and control channel; Compare with the average, then test sample 1
This is a pair-iYA value comparison module that calculates the amplitude of vibration to be applied to the iYA value.

Also, 6 is the RMS value from the limiter acceleration sensor to 11
OAD for limiter to measure, 7 is 3 at a time in one loop
A data collection module that reads the RMS values for two channels into memory, 8 is a limit value for each channel that is set when setting 771 (64 types of limit values can be set, and 4 types out of the above 64 types for each channel) A limit value table storage module 9 can be used to compare the limit value with the limiter channel measurement value, This is a limit value comparison module that determines whether the limit value is exceeded.

Furthermore, 10 is a frequency controller that calculates the frequency of vibration in the current loop from the sweep rate, frequency range, and number of loops, and this frequency is calculated by extracting the value at the frequency of the current loop from the target spectrum and calculating the next sine wave. used for.

Further, 11 is a sine waveform creation module that creates a sine waveform (constant amplitude) to be output in the next loop, 12 is a digital-to-analog (D/A) converter that converts the created sine waveform of digital data into an analog signal, and 13
14 is a limit control/average control switching module that switches to limit control when the limit channel exceeds the limit value and to average control otherwise; 14 is an amplitude controller that determines the amplitude of the sine wave to be output in the next loop; 15 is an output attenuator that adjusts the amplitude of the output sine wave from the D/A converter 12 to a proper value, and 16 is a smoothing filter that smoothes the stepped output of the D/A converter 12.

In this embodiment system, during sinusoidal sweep excitation control, the limit function for the purpose of protecting the specimen 'r is performed using the limiter acceleration data collection means. This reduces the burden on the control software and increases the Channels, simultaneous data input, saving of each limit data, control of limit patterns for each limit channel, etc. are possible.

These functions are especially necessary in vibration tests of large structures such as legs and aircraft, but the system of this embodiment achieves extremely high limit control accuracy by realizing multi-channel data input.

FIG. 2 is a block diagram of a concrete configuration of the system of this embodiment, in which GR-2514 vibration control system (trade name, manufactured by Zienrad, USA) is used.

In addition, 17 in the figure is a limit detector, which is a 12-channel 0PT-4006 (product name, manufactured by Tokyo Electron).
Three (maximum four) are used.

The system of this embodiment employs a one-menu operation, and is capable of controlling limit values at multiple points (control channel + limit channel = maximum 48 channels).

It is then possible to save the RMS value and set a limit value for each limit channel.

It also has 10 types of vibration protection functions (described later), and can display 9 types of spectrum display and 6 types/classes of numerical display during testing.

The specifications of the system of this embodiment will be explained below.

(1) Function setup...control parameter specification test...
Control execution data replay...Reading data from disk and display loop check...Checking connections before testingResume test...Rerunning interrupted testsAnalysis...Post test that only collects data... Report on the reason for the end or stop of the vibration test (2) Analog input For controlling the number of input channels...Maximum 8 channel limit...Maximum 40 channels Input level...Maximum ±10V Accelerometer sensitivity...Each input Setting for each channel (3) Detector input (limit control rn) Limit value...Set up for each channel Horizontal axis mode...Each frequency axis (resolution 1024 lines) Abort value...For each limit value Set 10 dB (4) Analog output Output channel...1 channel Output level...±10V Output level control...12 pin l-D/A converter x
12-bit attenuator output waveform...Sine wave (5) Control specifications Control method...1 channel, multi-channel average limit control combination, multi-channel maximum value, minimum value control spectrum...Effective value control frequency range... 5 to 2000 Hz Frequency accuracy...within 0.1% of excitation frequency Maximum output level...±IOV Minimum input/output level...±10mVrms Input/output dynamic range...60dB reduction Time accuracy...・11%
Sweep speed: 0.01 to 50 oct/m
i n (logarithm) (6) Test execution method automatic mode...specify sweep speed, test time manual mode...stop sweep, specify sweep in the opposite direction, restart sweep (7) Data Save setup item control signal (1024 points for each channel can be saved) *Total 48 points (40 channel limit + 8 channel control) (8) Protection function loop check... Confirm that the wiring is normal before testing Alarm...Abort that warns when the control error is outside the specified range...Limit Abort that stops when the control error falls outside the specified range...Set a tolerance value that is higher than the limit value, and Maximum external load rating that will stop if exceeds... Set the maximum rating of the vibration device,
Control signal loss that warns when the target spectrum exceeds the rating...If the control signal falls below the noise level, the test will be stopped.If the average value of the control signal differs from the target value by 20 dB or more, Stop the test Channel Overload Operator Abort Startup Time Shutdown Time Variable Compression Speed Variable Sweep Speed External Alarm Abort (RCI) (9) Display Function - Spread Vector Display - Control Channel Average Value Limit Control Channel Drive Spectrum Value Target Spectrum Control Alarm Level Control Abort Level Limit Level Limit Abort Value used for Level Control Error Spectrum Single Value Display Channels used for control (including limit channels) that display the next value in one loop After the test starts Time Current frequency Target value Unit (acceleration, velocity, displacement, etc.) Control value (10) Redisplay (spectrum, numerical display) Control channel limit Channel drive spectrum target Spectrum control Alarm, abort level limit Channel limit, abort level control Value used for error spectrum (difference between control and target) (11) Remote control According to the system of this embodiment, the limiter acceleration sensor attached to the part of the specimen T where vibration is to be restricted outputs Data is collected by limiter 0AD6,
A limit value comparison module 9 compares this data with predetermined limit data, and the amplitude controller 1
4 controls the amplitude of the vibration applied to the specimen 'r by the vibration excitation device S based on this comparison result, so that vibrations exceeding a certain level are not applied to the portion of the specimen T where vibration should be regulated.

Therefore, the specimen T is #! Even if the ends are susceptible to vibration, there is no risk that the specimen T will be damaged.

[Effects of the Invention] As explained above, according to the system of the present invention, the second data collection means collects the data output from the second vibration detection means attached to the part of the specimen where vibration is to be regulated. , the second data comparison means compares this data with predetermined limit data, and the vibration control means controls the amplitude of the vibration applied to the specimen by the vibration means based on the comparison result, so that the vibration Vibration tests on specimens that are extremely susceptible to vibration can be performed extremely easily.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a block diagram specifically showing the embodiment. DESCRIPTION OF SYMBOLS 1...Load, 2...Overall detector for control, 3...Data collection/average processing module, 4...
Target spectrum data storage module, 5...Target value comparison module, 6...Overall detector for limiter, 7...Data collection module, 8...Limit value table storage module, 9...Pair Limit value comparison module, 10...Frequency controller, 1
1... Sine waveform creation module, 12... D/A
Converter, 13... Limit control/average control switching module, 14... Amplitude controller, 15... Output attenuator, 16... Smoothing filter, 1
7... Limit detector, 18... Vibration control system, T... Specimen, S... Vibration device. Applicant Tokyo Electron Co., Ltd. Agent Patent Attorney Sasa Suyama - Figure 1

Claims (1)

[Claims] (1) A vibration excitation means for applying vibration to the specimen, a first vibration detection means attached to a part of the specimen where vibration is to be measured, and a first vibration detection means attached to a part of the specimen where vibration is to be regulated. a second vibration detection means; a first data collection means for collecting data output from the first vibration detection means; and a second data collection means for collecting data output from the second vibration detection means. a first data comparison means for comparing data obtained from the first vibration detection means and predetermined target vibration data; and a first data comparison means for comparing data obtained from the second vibration detection means and predetermined target vibration data and vibration control means for controlling the amplitude of the vibration applied to the specimen by the vibration excitation means based on each comparison result. vibration test system.